If anyone can challenge iTunes, it's Amazon. Amazon already has a well established customer base for books, CDs and other merchandise. Selling music for download is for Amazon the equivalent of placing impulse buy items next to the cash register at the grocery store.

Meanwhile...

AnywhereCD is shutting down. It's founder, Michael Robertson, writes here with his views on what went wrong.

Interesting stuff, and indicative of a retail entertainment and media industry that still just doesn't get it, and a high-tech industry still struggling to find a way to co-exist with those big media companies.

In other news, we can also add Virgin Digital to the long list of services that have not worked out. Maybe Richard Branson will have better luck with his airlines.